Block migration doesn't work

[Akira Yoshiyama]

Summary
=======

Block migration doesn't work on Nova folsom-3 with an error message below:

Live Migration failure: Unable to allow access for disk
path /var/lib/nova/instances/instance-0000000c/disk: No such file or directory

Related commit
==============

https://review.openstack.org/#/c/11395/

Patch to fix this problem
=========================

diff --git a/nova/virt/libvirt/driver.py b/nova/virt/libvirt/driver.py
index 8d3a364..a2817b3 100644
--- a/nova/virt/libvirt/driver.py
+++ b/nova/virt/libvirt/driver.py
@@ -2554,7 +2554,8 @@ class LibvirtDriver(driver.ComputeDriver):
                 # Remove any size tags which the cache manages
                 cache_name = cache_name.split('_')[0]

- image = self.image_backend.image(instance['name'], cache_name,
+ image = self.image_backend.image(instance['name'],
+ instance_disk,
                                                  FLAGS.libvirt_images_type)
                 image.cache(fn=libvirt_utils.fetch_image,
                             context=ctxt,

[Mark McLoughlin (markmc)]

From a quick look, it does look like the code is wrong and your patch is correct

Care to submit the patch to gerrit? http://wiki.openstack.org/HowToContribute

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/11934

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/11934
Committed: http://github.com/openstack/nova/commit/e4044c64de09a1b2bd78a344ecd54472d07b30d2
Submitter: Jenkins
Branch: master

commit e4044c64de09a1b2bd78a344ecd54472d07b30d2
Author: Yaguang Tang <email address hidden>
Date: Sat Aug 25 00:34:58 2012 +0800

    Make pre block migration create correct disk files.

    fix bug lp:1039356

    Change-Id: Iede2c6d2ec2b1a68c37d1e8f8735fd2e5d273c67